yes it is not to be taken lightly.
its a medical emergency if someone actually has AMI.. acute myocardial infarction
there are two types STEMI and NSTEMI
if its STEMI , then its grave emergency, every minute is important.
please tell about symptoms, ECG , bloood test( troponins)and other relevant history if you really want a genuine advice
Next Steps
consult your treating doctor asap